Texas Instruments TMS320C6457 DSP 9.2 Programming Standalone (SA) Mode

9.2 Programming Standalone (SA) Mode
9.2.1 EDMA3 Programming
9.2.1.1 Input Configuration Parameters Transfer
9.2.1.2 Systematics and Parities Transfer
Programming www.ti.com
Table 42 highlights the required EDMA3 resources to perform a standalone (SA) mode decoding. Eachset of EDMA3 parameters uses the EDMA3 linking capabilities. Section 9.2.1 details the EDMA3 transfersprogramming and Section 9.2.2 details the input parameters programming. Any notification mechanism toflag that a user-channel has just been decoded is left to you. Suggested implementation is to use theEDMA3 interrupt generation capabilities [see the TMS320C6457 DSP Enhanced Direct Memory Access(EDMA3) Controller Reference Guide (SPRUGK6 )] and program the EDMA3 to generate an interrupt afterthe user-channel's last TCPREVT synchronized EDMA3 transfer has completed.
This EDMA3 transfer to the input configuration parameters is a 16-word TCPXEVT frame synchronizedtransfer. The parameters should be set as:
•OPTIONS
– ITCCEN = 0 (Intermediate transfer complete chaining is disabled)– TCCEN = 0 (Transfer complete chaining is disabled)– ITCINTEN = 0 (Intermediate transfer complete interrupt is disabled)– TCINTEN = 0 (Transfer complete interrupt is disabled)– TCC = 1 to 63 (Transfer Complete Code)– TCCMODE = 0 (Normal Completion)– FWID = Don't care– STAT = 0 (Entry is updated as normal)– SYNCDIM = 0 (A-Sync. Each event triggers the transfer of ACNT elements.)– DAM = 0 (Dst addressing within an array increments. Dst is not a FIFO.)– SAM = 0 (Src addressing within an array increments. Source is not a FIFO.)
•SOURCE ADDRESS: User input configuration parameters start address (must be double-wordaligned)
•ACNT = 64 (No of bytes in an array - 16 32 bit Input Configurations to be transferred)
•BCNT = 1 (No of arrays of length ACNT)
•DESTINATION ADDRESS: TCPIC0 (5000 0000h)
•SRCBIDX = 0 (Source 2nd Dimension Index)
•DSTBIDX = 0 (Destination 2nd Dimension Index)
•SRCCIDX = 0 (Source 3rd Dimension Index)
•DSTCIDX = 0 (Destination 3rd Dimension Index)
•CCNT = 1 (No of frames in a block)
•BCNTRLD: Don't care
•LINK ADDRESS: Address in the EDMA3 PaRAM of the EDMA3 parameters associated with thesystematics and parities
Upon completion, this EDMA3 transfer is linked to the EDMA3 for systematics and parities transferparameters.
This EDMA3 transfer to the systematics and parities memory is a TCPXEVT frame-synchronized transfer.The parameters should be set as:
•OPTIONS:
– ITCCEN = 0 (Intermediate transfer complete chaining is disabled)– TCCEN = 0 (Transfer complete chaining is disabled)– ITCINTEN = 0 (Intermediate transfer complete interrupt is disabled)
66 TMS320C6457 Turbo-Decoder Coprocessor 2 SPRUGK1 – March 2009Submit Documentation Feedback